Die-head.



PATENTED MAR. 12, 1907.

W. A. KERR.

DIE HEAD.

APPLICATION FILED 0cT.16|1905- lnveniqr by I Witnesses Attorneys THE NORRIS PETERS co, wAsH|Nmou,-n. c.

7 0 g 2 1 A M D E T: N T A P H. RD EA KB .H B I v W APPLICATION FILED 00T.16, 1905.

2 SHEETS-SHEET 2.

Investor Witnesses Attorneys FFIGE.

WILLIAM A. KERR, OF NEW CASTLE, PENNSYLVANIA.

DIE-=HEAD.

Specification of Letters Patent.

Patented March 12, 1907.

Application filed October 16, 1905. Serial No. 288,045.

To all whom it may concern.-

Be it known that I, WILLIAM A. KERR, a citizen of the United States, residing at New Castle, in the county of Lawrence and State of Pennsylvania, have invented a new and useful Die-Head, of which the following is a specification.

This invention relates to die-heads of that general class employed in pipe-machines for threading and cutting pipes, and more specifically to what are known as mill-type pipe-heads, wherein the die-carriers are formed of a pair of approximately semicircular members pivoted to the fixed case of the head and movable toward and from each 7 other by right and left hand screws.

toward or from each other.

l/Vith these and other objects in view, as will more fully hereinafter appear, the invention consists in certain novel features of construction and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claim, it being understood that various changes in the form, proportions, size, and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure 1 is an elevation of a die-head constructed in accordance with the invention, the die-carriers being shown in closed osition. Fig. 2 is a similar view with the ies adjusted to open position. Fig. 3 is a vertical section of the die-head on the line 3 8 of Fig. 2. Fig. 4 is an elevation of the cam-ring detached.

Similar numerals of reference are employed to indicate corresponding parts through the several figures of the drawings.

The invention is applicable to machines wherein the die-head is held stationary, as on pipe-machines, or to die-stocks of that general type in which handles are employed for revolving the stock during the threading or cutting operation, and in the latter case the usual leader-screw may be employed. The die-head in the present instance is illustrated as supported by a carrier A, which may be of any desired construction. To this carrier A is secured the fixed head 10, circular in form and provided with a central opening for the passage of the pipe or bar being operated upon. The upper and lower portions of the head are provided with forwardly-extending flanges 11, between which is seated a camring 12, and the inner edge of the cam-ring is provided with an annular groove 13 for the reception of a projecting flange 14 of a sup porting-ring 15, that is secured by screws 16 to the head 10, so that the cam-ring will be held in roper position and will be free to turn in tlie annular space between the flanges 11 and the ring 15. The periphery of the cam-ring is provided at one point with a rack 17, the teeth of which are engaged by the teeth of a segment 18, that is mounted on a stud 19, carried by a bracket 20, projecting from the head 10, and to the segment 18 is secured an operating-handle 20, through which movement may be transmitted to the cam-ring for the purpose of turning the latter in one direction or the other.

The upper and lower portions of the flange 10 are provided with horizontally-disposed grooves 21, that are parallel with each other. In the grooves 21 are arranged the inner edges of guide-bars 22, that are rigidly secured in place by screws 23. The projecting edges of the guide-bars are dovetailed in crosssection and fit in correspondingly-shaped grooves formed in the projecting ends 24 of the die-carriers 25, and these bars are so.

arranged that the die-carriers can only move in a direct path from and toward the central vertical plane of the head.

The two die-carriers 25 are formed of a single piece of metal that is first turned and finished and afterward split by a saw, milling-cutter, or other tool, and the space left by the kerf or the material removed is compensated for by stop-screws 27, that are carried by the projections of one section and bear against the projections of the opposite section, said screws being first adjusted With the utmost accuracy, so that when in engagement with' the opposite section the two sections shall form a perfect circle that is interrupted at the division-line between the two sections. The screws may be locked in place by suitable nuts 28.

IIO

The two die-carrying sections are pro vided with threading, cutting, or other dies at; of any suitable construction and held in place in any suitable manner, and to the rear of each section is secured a number of pins 30, that extend through curved cam-slots 31, formed in the cam-ring 12. The inner ends of the pins have reduced threaded portions that screw into the threaded openings formed in the sections 25, and their outer ends having enlarged heads 33, that fit in enlarged or countersunk portions of the camgrooves.

By the employment of direct-moving die-' carriers in place of the pivoted carriers the structure may be made serviceable for a much longer period of time than usual,

owing to the fact that there is no wear on any of the parts that control the positioning of the die-carriers, and the utmost accuracy of adjustment may be obtained by turning the screws 27. At the same time the threading or cutting dies are all brought into operative position at the same time as distinguished from the pivoted carrier where the dies nearest the pivots are first brought into play as the die-carried sections are adjusted toward the work. v

Having thus described the invention, what is claimed is- In a device of the class described, the combination with a support, of a pair of parallel guide-bars carried thereby, a pair of die-carriers having slots for the reception of said guide-bars, said die-carriers being main tained in parallel relation, and being simultaneously movable toward and from each other, headed pins extending rearwardly from'the die-carriers, and a cam-ring having undercut cam-slots'for the reception of said pins, the inner edge of the cam-ring having an annular groove, a supporting-ring secured to the support and having a flange fitting within said groove to maintain the cam-ring in proper position. i

1n testimony that I claim the foregoing as my own I have hereto afiiXed my signature in the presence of two witnesses.

WILLIAM A. KERR.

Witnesses:

L. M. BUCHANAN, H. WV. CASTLE. 

